This video shows how to get to the secret digital tachometer (RPM gauge), and how it works :)

1= Distance Impulse number - the number of speedo sender pulses required to +1 the odometer. for miles the number is in the 6000 range, for kilometers the number is in the 3000 range.
2 = Clock display mode - 1: Europe (24 hour time) 2: Canada? 3. UK (12 hour) 4. USA (12 hour) 5. South Africa?
3 = Speedometer and rev. counter code
4 = number of cylinders, or ratio for alternator/engine revolutions. (for tach calibration)
5 = Segment test (lights all LCD segments)
6 = Speedomenter sender impulses - each wheel revolution adds 7 to this count.
8 = program version

Thanks to oxytrue for info :)

Also, some people has reported that it does not work on some diesel models.

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